Kaley is measuring the time from the antecedent to the onset of the target response. What type of data collection is this?

• A. Duration
• B. Latency
• C. Frequency
• D. Interresponse Time

Answer: (B)

Latency measures the elapsed time from a stimulus to the start of the behavior. In this case, Kaley is recording how long after the antecedent the target response begins, which is exactly what latency tracks. This is different from duration (how long the response lasts), interresponse time (the gap between the end of one response and the start of the next), and frequency (how often the behavior occurs). For example, if the antecedent is a prompt and the child starts the response after 2 seconds, that 2-second period is latency.